Telephone-switchboard.



No, 623,504. Patented may 7, 190|.

l. .1. Kusel.. TELEPHUNE SWITCHBUARD.

(Application led Sept. 27, 1900.)

3 Sheets-Sheet l.

(No Model.)

No. 673,5114.v

(No Mode.)

I. JI' KUSEL.

TELEPHONE SWITCHBOABD.

(Application filed Sept. 27, 1900.)

Patented May 7, |90l..

3 Sheets-Sheet 2,

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UNITED. STATES PATENT OFFICE.

ISIDOR J. KUSEL, OF CHICAGO, ILLINOIS, ASSIGNOR TO EUREKA ELECTRICCOMPANY, OF SAME PLACE.

TELEPHONE-SWITCHBOARD.

SPECIFICATION forming part of Letters Patent N o. 673,504, dated May '7,1901.

Application iiled September 27, 1900. Serial No. 31,258. (No model.)

To a/ZZ whom it may concern: showing the connection of the subscribersBe it known that I, ISIDOR J. KUSEL, a citicircuit to the jack and drop.

z'en of the United States, residing at Chicago, Like letters ofreference indicate correin the county of Cook and State of Illinois,sponding parts throughout the several views.

have invented certain new and useful Im- This combined jack and drop isintended 55 provements in Telephone Switchboards, of for use inconnection with telephone-switchwhich the following is a specification.boards of any of the ordinary forms, and, as

The object of this invention is the producin other switchboards,twoplugs are usedtion' of a combined spring-jack and drop for to wit, theanswering-plug and the ringing- 1o telephone-switchboards which shall becomplug-the former being the plug which the 6o pact in form, simple andstrong in its conoperator inserts into the jack on. the circuitstruction,easilyattachable t0 the switchboard of the calling subscriberand the latter the or removable therefrom, wherein electrical oneinserted into the jack on the circuit of connections between the linesof the boardY the called subscriber. These plugs are eiecand those ofthe jack and drop are made or trically connected, and in the circuitformed 65 broken by said acts of attachment or detachbetween them it isintended that the operment, wherein the action of the magnetic atorscircuit may be included or bridged coil is strengthened by a tubularshell of a in when it is necessary that she should listen conductingmetal, wherein the annunciatoror ringlon any subscribers line.

zo plate falls sidewise in a plane parallel with A night-bell circuit,normally open, is ar- 7o the face of the board, wherein said annunrangedto be closed upon the falling of the ciator-plate is automaticallyrestored to poannunciator-plate, whereby the alarm-bell of sition by theinsertion of a plug into the jack, said circuit is caused to ringcontinuously un- Wherein the jack is not liable to accidental til by therestoration of the fallen plate the z 5 displacement by the jarring ofthe switchnight-bell circuit is again broken. The elec- 75 board, andembodying the other and further trical connections for this night-bellcircuit improvements herein set forth. A and for the subscribers linesare permanently In the accompanying drawings, Figure lis secured tocontact-points on a stationary pora front elevation of this improvedjack and tion of the switchboard, which said contactdrop. Fig. 2 is arear elevation of the same, points are arranged to engage corresponding8o showing the means for mechanically attachcontact-points on the jackand drop and in ing the jack and drop to the switchboard and electricalconnection with the proper lines of the contacts foritselectricalconnection therethe latter, by which arrangement the act ofwith. Fig. 3 is a side elevation of said jack lmechanically clamping orsecuring the jack and drop. Fig. et is a similar view showing and dropto the switchboard electrically con- 85 the opposite side of said jackand drop. Fig. nects the lines therein with the 'lines of the 5 is aplan View of the same. Fig. Bis a lonboard and whereby the detachment ofsaid gitudinal vertical central section thro ugh said securing meansinterrupts said electrical conjack and drop, the tubular shellsurround-I nection. A tubular shell of soft-iron sur- 4o ing the coilbeing shown entire. Fig. 7 is a rounds the electromagnet and isconnected 9o longitudinal central section through the tubuwith the coreof said magnet, its purpose belar shell surrounding the coil. Fig. 8 isa ing to intercept the magnetic lines of force detail view in section,showing the means for which envelop the coil, offering said lines ofloosely mounting the plug which completes force a good conductor fromone pole of the the nightbell circuit when the annunciatormagnet to theopposite pole thereof, thus 95 plate falls. Fig. 9 is a diagrammaticview preventing their mingling with similar lines showing the night-bellcircuit and a subof adjacent coils and by said mingling proscribers linein connection with the jack and ducing cross-talk on contiguous lines.drop of my invention. Fig. l0 is a horizon- In theembodiment here shownof this in- 5'o tal sect-ion on dotted line 10 10 of Fig. 9, vention aclamping screw-bolt forms the seroo curing means between the jack anddrop and the switchboard, and the mere tightening or loosening of saidbolt connects said jack and drop with the switchboard or disconnects ittherefrom electrically as well as mechanically.

In the construction of this jack and drop I provide an electromagnet A,having the core A' and the usual winding A2. A tubular shell A3,permanently closed by the end A4, surrounds said magnet and is held inposition relative to the latter by means of a screw A5, passing throughan opening in the end A4 and into an axial screw-threaded opening insaid core. The screw A5 also holds the electromagnet and its shell inposition upon the supporting-frame A6. A tilting latch-bar A7 ispivotally mounted in supports A8 upon the tubular shell A3 near the openend thereof. This latch-bar is of non-magnetic material,as brass, andhas secured to its downwardly-extending forward end the armature A9 forsaid electromagnet. This armatureis a circular disk corresponding indiameter to that of the tubular shell A3. The opposite end of thetilting latch-bar is adapted to engage and hold elevated theannunciator-plate, which will next be described. y

B is a shaft capable of an oscillatory motion, journaled in thesupporting-frame A4. At its forward end it bears the annunciatorplateB', rigidly secured to said shaft at one of its lower corners. The rearend of the shaft B carries thedetent-nger B2, rigidly fixed to saidshaft, which detent-finger is adapted to be engaged by the latch-bar A'Iand be held thereby in an elevated position. When an electric currentenergizes the electromagnet A, the armature A9 is attracted toward thecore A', lifting the rear end of the pivoted latch-barA7 from itsengagement wit-h the detent-ii'nger B2 and permitting theannunciator-plate B to fall. The shaft B also has a projecting lug B3,bearing at its outer end the plug B4, loosely mounted on said lug, theobject of this plug being to complete the night-bell circuit when theannunciator-plate falls. The plug is loosely mounted on the outer end ofsaid lug, so that it may always wedge between the two contact-points ofthe night-bell circuit and not rest upon one alone, as it might do ifrigidly fixed to said lug-and the adjustment of the latter was notperfect with relation to said contact-points.

C is the face-plate of the j ack and drop, and it has the opening C' forthe reception of the plug. On the rear side of said face-plate C is ametallic base portion G2, extending to the rear extremity of the jack.This base portion contains the pivoted restoring-arm C3, the upturnedend C4 of which is adapted to engage the lug B3, rigidly secured to theshaft B, and by its upward movement to oscillate the shaft B and restorethe annunciator-plate to its normal position. The restoring-arm C3 is soformed that it will be engaged rearward of its pivot by the insertedplug. C5 is a loop for the attachment of one end'of thefprimary wire ofthe magnetic coil A. C6 is a baseblock of non-conducting material,having the verticai slot G7 at its rear end. It is held rigidly inposition by a screw passing through the lower part of thesupporting-frame A6 and another screw extending-upward from the metallicbase portion C2. On one of its sides it has the contact-plate C8 inelectrical connection with one end of the primary winding of theelectromagnet, and overlying said contact-plate and secured at' the rearend of the non-conducting base-block C's is the contact-spring C9,adapted to have contact with the forward end of the inserted plug andalso with the contactplate C8. When the plug is inserted into theopening C,the contact-spring C9 is raised from the contact-plate C8. Acontactfplate C40 is secured to the rear end of the non-conducting blockC6 on the upper side thereof and has the upturned lip G11. A stud O42extends vertically thro ugh the base-block CG at a point adjacent to theupturned lip C14, and it is beveled on the side toward said upturned lipin order to form with said lip an inclined opening for the reception ofthe plug B4 on the lug B8, the upturned lip G11 and the plug B4constituting the ends of the nightbell circuit to be closed when thespace between them is bridged by the insertion of said plug B4. The studC12 extends downward a little distance below the base-block C6 in orderto engage a spring forming a portion of the night-bell circuit, mountedupon a portion of the switchboard to be next described.

D is one of the transverse bars of aswitchboard. It has thecontact-points D', which are terminals of a subscribers line, and thecontact-spring D2 and the contact-plate D3, both portions of thenightbell circuit. The transverse bar D is vertically perforated and isprovided with a screw-bolt D4, the upper end of which bolt is adapted toextend through the slot C7 in the rear end of the base-block O6 andmechanically and electrically connect the jack and drop with theswitchboard.

E is a plug of the usual description.

In operation the jack and drop are attached to the transverse bar ot theswitchboard by means of the screw-bolt D4. This places the electromagueton the subscribers line, the electrical connections being one of thecontact-points D on the transverse bar D of the switchboard, thecontact-spring C9, the contact plate O8, the primary winding of theelectromagnet, the connecting-loop C5, the metallic" frame A6, and theother contactpoint D' of the subscribers circuit. When a call isJ madeby a subscriber, the electric current passing over the line justspecified energizes the electromagn et, and its armature A9 is attractedtoward the core A and the shell A3, raising the latch-bar AT fromengagement with the detent-finger B2 and permitting theannunciator-plate to fall. The

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plug B4 falls into electric contact with the stud C12 and the lip C11,completing the nightbell circuit. When the plug is inserted in theopening C', its forward end engages the restoring-arm C3, causing theforward end of the latter to raise the detent-finger B2 into an elevatedposition, where it is retained by the latch-bar A7. The insertion of theplug also mechanically moves the free end of the contact-sprin g Cgawayfrom the contact-plate C8, electrically removing the electromagnet fromthe subscribers line and placing the lines of the plugin electricalconnection with said subscribers line in order to lpermit the loperatorfirst to listen over said line to ascertain the subscribers desires andafterward to connect the calling subscriber with any other number on theboard. The lines of force generated by the passage of a current throughthe coil follow almost entirely the path provided for them by thetubular shell VA8 and the core A of theelectromagnet, thus not onlyproducing a very efficient electromagnet, but also preventing any of thelines of force from extending beyond the limits of the shell. Anelectromagnet provided for use with the tubular shell is Wound to aresistance of from five hundred to fifteen hundred ohms.

I claim as my inventionl. In a jack and drop for telephone-switchboards,in combination, a jack adapted for the reception of a plug; anelectromagnet; an annunciator-plate arranged to fall in a substantiallyvertical plane; a shaft supporting the plate at one of its ends; afinger carried at the other end of said shaft; and a pivotedrestoring-arm arranged to be engaged by said plug cooperating with saidfinger to restore said annunciator-plate.

2. In a jack and drop for telephone-switchboards, in combination, a jackadapted for the reception of a plug; an electromagnet; a tubular shellsurrounding said electromagnet; an annunciator-plate arranged to fallina substantially vertical plane; a shaft supporting said annunciator-plate at one end of said shaft;a finger carried at the otherend of said shaft; and a pivoted restoring-arm arranged to be engaged bysaid plug, coperating with said arm to restore said annunciator-plate.

3. In a jack and drop for telephone-switchboards, in combination, a jackadapted for the reception of a plug; an electromagnet; a tubular shellsurrounding said electromagnet, which shell is closed at one end and islattached to the core of said magnet; an annunciator-plate arranged tofall in a substantially vertical plane; a shaft supporting the plate atone end of said shaft; a finger carried atthe other end of said shaft;and a pivoted restoring-arm arranged to be engaged by said plug,cooperating with said linger to restore said annunciator-plate.

4. In a jack and drop for telephone-switchboards, in combination, a jackadapted for the reception of a plug; a restoring-arm arranged to beengaged by said plug; an electroinagnet; an armature for said magnet; anannunciator-plate adapted to fallin a substantially vertical plane; anoscillatory shaft for supporting the plate; and a detent-finger fixed onsaid shaft, for holding the annunciatorplate elevated.

5. In a jack and drop for telephone-switchboards, in combination, a jackadapted for the reception of a plug; a pivoted restoringarm arranged tobe engaged by said plug; a magnet; an armature; an annunciator-plateadapted to fall in a substantially vertical plane; an oscillatory shaftfor supporting the plate; and a detenta-finger fixed on said shaft, anda latch for engaging said finger and preventing the oscillation thereof.

6. In a jack and drop for telephoneswitch boards, in combination, a jackadapted for the reception of a plug; a pivoted restoringarm arranged tobe engaged by said plug; an electromagnet; an armature for the magnet;an annunciator-plate; an oscillatory7 shaft for supporting saidannunciator-plate, which 4shaft extends parallel with the core of themagnet; a detent-nger fixed lon said shaft; an open night-bell circuit;and means for closing the night-bell circuit when the annunciator-platefalls.

7. In a jack and drop for telephone-switchboards, in combination, a jackadapted for the reception of a plug; a pivoted restoringarm arranged tobe engaged by said plug; an open night-bell circuit; an electromagnet; atilting latch-bar; an annunciator-plate; an oscillatory shaft forsupporting said an nunciator-plate; a detent-Iinger fixed on said shaft;an open night-bell circuit; and means on said shaft, adapted to closethe night-bell circuit when the annunciator-plate falls.

8. In a jack and drop for telephone-switchboards, in combination, abase-block having a slot at its rear end; asupporting-frame; anelectromagnet; an armature; a detent-inger; a shaft; anannunciator-plate fixed at a point below its center of gravity to saidshaft; a

contact-point and a contact-spring connected to the ends of asubscribers telephoneline; and means for forming an electricalconnection between said contact-point and the magnet.

9. In an annunciator-drop, in combination, a drop-plate arranged to fallsidewise in a substantially vertical plane; an electromagnet forcontrolling said drop-plate; a shaft for supporting said drop-plate; adetent-inger on said shaft; a latch-bar adapted to engage saiddetent-linger; and means for withdrawing said latch-bar from the path 0fthe detent-iinger.

10. In an annunciator-drop, in combination, a drop-plate arranged tofall sidewise in a substantially verti cal plane; a shaft for supportingsaid drop-plate; a detent-nger also on said shaft; a latch-bar adaptedto engage said detent-finger; an electromagnet; and an IOO IIO

armature for said magnet, for withdrawing said latch-bar from engagementwith said detent-finger.

11. In an annunciator-drop, in combination, a drop-plate arranged tofall sidewise in a substantially verticalV plane; a shaft for saiddrop-plate; a detent-inger on said shaft; a latch-bar adapted to engagesaid detent-inger; an electromagnet; an armature for the magnet, forwithdrawing said latch-barfrom the path of said detent-inger; and atubular shell adapted to surround said magnet and confine the magneticlines of force of said magnet.

l2. In an annunciator-drop, in combination, an oscillating shaft; adrop-plate fixed at a point below its center of gravity to said shaft; adetent-nger fixed directly to said shaft, for preventing said drop-platefrom falling; a latch-bar adapted to engage said detent-iinger; and anelectromagnet for withdrawing said latch-bar from the path of saiddetent-nger.

13. In an annunciator-drop, in combination, a shaft capable of anoscillatory movement; a drop-plate arranged to fall in a substantiallyvertical plane, fixed on said shaft;

a detent-nger also fixed on the shaft; a magnet; an armature; and an armon said armature adapted to engage said detent-iinger.

14. In an annunciator-drop, in combina- I tion, a shaft capable oi' anoscillatory movement; a drop-plate arranged to fall in a substantiallyvertical plane, fixed at one end of said shaft, and capable of beingsupported in unstable equilibrium; a magnet; an armature; an arm on saidarmature; and a detentnger adapted to engage said arm.

15. In a telephone-switchboard, in combination, a supportingrail havingcontactpoints for the connection of the subscribers line-Wires, alsohaving contact-points for the night-bell circuit; a series of jacks anddrops;

a base-block for each of said jacks and drops,

each of which base-blocks is provided with a slot for the reception of asecuring means, also with contact-points corresponding to the saidcontact-points on said supporting-rail; a stud extending through saidbase-block for engaging one line of the night-bell circuit; a plateadjacent to said stud; and a bolt for securing'each of said jacks anddrops to said supporting-rail, which bolt also makes electricalconnection between one of the lines of the night-bell circuit and saidplate.

16. In a telephone-switchboard, in combination, a series of combinedjacks and drops; contact-points xed on the switchboard for theconnection of a subscribers line-Wires, also contacts for the night-bellcircuit; a baseblock for each of said combined jacks and drops, each ofwhich base-blocks is provided with a slot for the reception of asecuring means, also with contacts corresponding to those for theattachment of the subscribers line-Wires, also having a stud forelectrically engaging one line of the night-bell circuit, and acontact-plate having an upturned end, and an opening in the body of theplate; and a securing-bolt passing through a portion of the switchboardand the slot in said baseblock, and making contact between said platehaving the upturned end and one of the lines of the night-bell circuit.

17. In a telephone-switchboard, in combination, a series of combinedjacks and drops; contact-points fixed on the switchboard for theconnection of a subscribers line-Wires; a night-bell circuit, one lineof which is provided With a projecting contact-spring; a base-block foreach of said combined jacks and drops, each of which base-blocks isprovided with an opening for a securing means, also having contactscorresponding to those for the attachment of the subscribers linewires,also having a stud for engaging the said contact-spring of thenight-bell circuit, and having a contactplate with an upturned end; anda bolt for securing the combined jack and drop to the switchboard, whichbolt also forms an electrical connection between one line of thenight-bell circuit and the plate having an upturned end.

18. In a telephone-switchboard, in combination, a series of combinedjacks and drops;

contact-points fixed on the switchboard for the connection of asubscriber-s line-wires; a night-bell circuit, one line of which isprovided with a projecting contact.- spring; a base-block for each ofsaid combined jacks and drops, each of which base blocks is providedwith a slot for a securing means, also having contacts corresponding tothose for the attachment of the subscribers linewires, also having astud for engaging the Said contact-spring of the night-bell circuit, andhaving a contact-plate with an upturned end adjacent to the said stud;means for securing the combined jack and drop to the switchboard, whichmeans also forms an electrical connection betweenone line of thenightbell circuit and the plate having the upturned end; and a plug formaking contact between the last-named plate and the said stud when theannunciator-plate falls.

ISIDOR J. KUSEL.

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